rb_cb_lb.java

J2ME lwuit实现屏幕九宫图,功能十分强大

/*
 * Copyright ?2008 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 *
 */
package com.sun.lwuit.uidemo;

import com.sun.lwuit.ButtonGroup;
import com.sun.lwuit.CheckBox;
import com.sun.lwuit.Command;
import com.sun.lwuit.Component;
import com.sun.lwuit.Dialog;
import com.sun.lwuit.Form;
import com.sun.lwuit.Label;
import com.sun.lwuit.RadioButton;
import com.sun.lwuit.layouts.BoxLayout;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;

/**
 * 演示RadioButton、CheckBox、Label的使用
 */
public class Rb_Cb_Lb implements ActionListener {
public Form form = new Form("Rb_Cb_Lb");
public  Command backCommand = new Command("Back", 1);//返回按钮
public  Command selectCommand = new Command("select", 2);//确认选择的按钮
//ButtonGroup就是把所有的RadioButton放在一起，选择唯一
public ButtonGroup group = new ButtonGroup();
    Rb_Cb_Lb(){
        form.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
        form.addCommand(backCommand);
        form.addCommand(selectCommand);
        form.setCommandListener(this);

        Label cdlabel = new Label("CheckBox:");
        cdlabel.getStyle().setMargin(Component.BOTTOM, 0);
        form.addComponent(cdlabel);

        final CheckBox firstCB = new CheckBox("First CheckBox");
        firstCB.getStyle().setMargin(Component.TOP, 1);
        form.addComponent(firstCB);

        final CheckBox secondCB = new CheckBox("Second CheckBox");
        secondCB.getStyle().setMargin(0, 5, 2, 2);
        form.addComponent(secondCB);

        Label rblabel = new Label("RadioButton:");
        rblabel.getStyle().setMargin(Component.BOTTOM, 0);
        form.addComponent(rblabel);

        final RadioButton firstRB = new RadioButton("First RadioButton");
        form.addComponent(firstRB);
        
        final RadioButton secondRB = new RadioButton("Second RadioButton");
        form.addComponent(secondRB);

        final RadioButton thirdRB = new RadioButton("Third RadioButton");
        form.addComponent(thirdRB);

        ActionListener listener = new ActionListener() {
        //这里是处理CheckBox、RadioButton 点击事件处理程序
            public void actionPerformed(ActionEvent arg0) {
                Object source = arg0.getSource();
                if(source==firstCB)
                    Dialog.show("Rb_Cb_Lb","firstCB", "OK", null);
                else if(source==secondCB)
                    Dialog.show("Rb_Cb_Lb","secondCB", "OK", null);
                else if(source==firstRB)
                    Dialog.show("Rb_Cb_Lb","firstRB", "OK", null);
                else if(source==secondRB)
                    Dialog.show("Rb_Cb_Lb","secondRB", "OK", null);
                else if(source==thirdRB)
                    Dialog.show("Rb_Cb_Lb","thirdRB", "OK", null);
            }
        };

        //往ButtonGroup加入radiobutton
        group.add(firstRB);
        group.add(secondRB);
        group.add(thirdRB);
        firstRB.addActionListener(listener);//加入事件监听
        secondRB.addActionListener(listener);//加入事件监听
        thirdRB.addActionListener(listener);//加入事件监听

//----为复选框加入事件监听
        firstCB.addActionListener(listener);
        secondCB.addActionListener(listener);
    };

    public void actionPerformed(ActionEvent arg0) {
    //这里处理Command 以及 判断ButtonGroup所选中的RadioButton
        Command cmd=arg0.getCommand();
        if(cmd==backCommand)
            UIDemoMIDlet.backToMainMenu();
        else if(cmd==selectCommand)
        {
            String str="ButtonCount:"+group.getButtonCount()+'\n'+
                       "SelectedIndex:"+group.getSelectedIndex()+'\n'+
                       "RadioButton:"+(group.getRadioButton(group.getSelectedIndex()).getText());
            Dialog.show("Rb_Cb_Lb",str, "OK", null);
        }
    }
}